Question

solve for x. write the samller solution first, and the largest solution second 4x^2+72x+320=0​

Answer 1

Answer:

x=8 or x=10

Step-by-step explanation:

Use the quadratic formula$x = \frac{-b +- \sqrt[]{b^{2} -4ac} }{2a}$

a is the number before x^2

b is the number before x

and c is the remaining number

a=4; b=72; c=320

However, all these can be divided by 4

a=1; b=18; c=80

Sub all these into the formula.

I like to start with the 2a denominator

2a = 2(1) = 2

(Im doing these piece by piece otherwise it gets a bit messy)

Next: 4ac  -- 4(1)(80) = 320

b^2 = 18^2 = 324

324 - 320 = 4

So now we are left with $\frac{-b+- \sqrt{4} }{2}$

simplified: $\frac{18+-2}{2}$

So our answers are 10 and 8

Answer 2

Answer:

Upper answer is wrong answer is -10,-8

Step-by-step explanation: If you want to know the truth just insert 8 or 10 in the equation