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19137 Marks
The sum of two numbers is 21.
The second number is six times the first number.
Work out the two numbers.
Write your answers on one line.

3 & 18

Step-by-step explanation:

x+6x = 21

7x=21

x=21/7

x= 3

21-3 = 18

so 3 and 18

answer: f = 32.2m

step-by-step explanation: that is the answer

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.