Mathematics, 17.08.2020 19:01 jessicajose4238

which of the following are solutions to the equation below x^2+4x-9=x+1 check all that apply a. 2 b. 4 c. -7 d. -3 e. -5 f. -4

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Answer from: Delgadojacky0206

a. and e.

Step-by-step explanation:

Hello, there are two ways to handle this kind of question.

... Either you solve the equation ...

$x^2+4x-9=x+1\\\\x^2+3x-10=0\\\\x^2-2x+5x-10=x(x-2)+5(x-2)=(x+5)(x-2)=0\\\\x= -5 \ \ or \ \ x = 2$

So the right answers are a. and e.

... Or, you check which answer can be right.

We replace x by 2 and the two expressions are equal.

$2^2+4*2-9=4+8-9=3 \ and \ 2+1=3$

So this is a. 2

We replace x by 4 and the two expressions are not equal.

$4^2+4*4-9=16+16-9=23 \ and \ 4+1=5$

So this is not b. 4

We replace x by -7 and the two expressions are not equal.

$7^2-4*7+9=49-28+9=30 \ and \ -7+1=-6$

So this is not c. -7

We replace x by -3 and the two expressions are not equal.

$3^2-4*3-9=9-12-9=-12 \ and \ -3+1=-2$

So this is not d. -3

We replace x by -5 and the two expressions are equal.

$5^2-4*5-9=25-20-9=-4 \ and \ -5+1=-4$

So this is e. -5

We replace x by -4 and the two expressions are not equal.

$4^2-4*4-9=16-16-9=-9 \ and \ -4+1=-3$

So this is not f. -4

Thank you.

Answer from: Quest

You have to find the angle i don’t know if i i try
Abcd is a parallelogram. find m ∠d. enter the answer as a number. abcd is a parallelogram. find the

Answer from: Quest

step-by-step explanation: the declaration of the rights of man and of the citizen (french: déclaration des droits de l'homme et du citoyen de 1789), set by france's national constituent assembly in 1789, is a human civil rights document from the french revolution.[1]

the declaration was drafted by the abbé sieyès and the marquis de lafayette, in consultation with thomas jefferson.[2] influenced by the doctrine of "natural right", the rights of man are held to be universal: valid at all times and in every place, pertaining to human nature itself. it became the basis for a nation of free individuals protected equally by the law. it is included in the beginning of the constitutions of both the fourth french republic (1946) and fifth republic (1958) and is still current. inspired by the enlightenment philosophers, the declaration was a core statement of the values of the french revolution and had a major impact on the development of freedom and democracy in europe and worldwide.[3]

the 1789 declaration, together with the 1215 magna carta, the 1689 english bill of rights (1689), the 1776 united states declaration of independence, and the 1789 united states bill of rights, inspired in large part the 1948 united nations universal declaration of human rights

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