Question

4x²+28x-72
please give me answer fast ​

Answer 1

Answer: -9 and 2

Step-by-step explanation:

Given, 4x² + 28x -72

Dividing this equation by 4

We get, x² + 7x - 18

Now, we wanna find two numbers whose sum is 7 and product is -18

The numbers are, 9 and -2

∴ x² + 7x - 18 = (x + 9)(x - 2) = 0

Hence, x = -9 and x = 2

HOPE THIS HELPS............

Answer 2

Answer:

-9, 2

Step-by-step explanation:

4x²+28x-72

to simplify, for now let us take out 4

hence,

4(x²+7x-18)

let us ignore 4 for now

x²+7x-18

=x²-2x+9x-18

=x(x-2)+9(x-2)

=(x+9)(x-2)

since, we had ignored 4, let us now multiply it again to get the original equation

4x²+28x-72

=4(x+9)(x-2)

=(4x+36)(x-2)

hence, roots of the equation are

4x+36=0 or x-2=0

4x=-36 or x=2

x=-9 or x=2