Mathematics, 04.10.2019 18:30 brutalgitaffe

How the goddam hell do i do this dumb common core hellish math

Answers: 1

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Answers

Jeffry is wrong because it only works for 4
let's say jef was right
we would get (4)(4)=4, then 16=4 which is false, go back to school, jeff
we will solve to find out if george is right later (he's wrong because he set it 0 when it is equal to 4)

anwyay, the way to do it is expand, make one side 0 and then factor, then set each factor to 0
so
expanding we get
2x²+5x-3=4
minus 4 both sides
2x²+5x-7=0
ok, we need to use the ac method or something
for ax²+bx+c=0 where a is not eual to 0, multiply a and c and call the result r, find what 2 numbers multiply to get r and add to get b in the equation

2x²+5x-7=0
2 times -7=-14
what 2 numbers multiply to get 5 and add to get -14
-2 and 7
split middle number up

2x²-2x+7x-7=0
group
(2x²-2x)+(7x-7)=0
factor
2x(x-1)+7(x-1)=0
undistribute
(2x+7)(x-1)=0

set each to 0

2x+7=0
2x=-7
x=-7/2

x-1=0
x=1

x=-7/2 and 1
that's how it works

to check

x=-7/2
(2(-7/2)-1)((-7/2)+3)=4
(-7-1)((-7/2)+(6/2))=4
(-8)(-1/2)=4
8/2=4
4=4
true

x=1
(2(1)-1)(1+3)=4
(2-1)(4)=4
(1)(4)=4
4=4
true

x=-7/2 and 1
george and jeff are wrong

Answer from: Quest

-13

step-by-step explanation:

f(x)=2x-5 for f(-4)

f(-4) means let x=-4

f(-4) = 2(-4) -5

f(-4) =-8-5

= -13

Answer from: Quest

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

$ab^2+ac^2=bc^2$

$ab^2+ac^2=x^2$ )

triangle abd and cba are similar,

$\frac{ab}{bc}=\frac{bd}{ab}$

$ab^2=bc\cdot bd$

$25=bc\cdot bd$ (2)

triangle cad and cba are similar,

$\frac{ac}{bc}=\frac{cd}{ac}$

$ac^2=bc\cdot dc$

$7\times 7=bc\cdot dc$

$49=bc\cdot dc$ )

using (1), (2) and (3), we get

$25+49=x^2$

$74=x^2$

hence proved.

therefore option 2 is correct.

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