Question

Use the quadratic formula to solve (x − 4)(x + 5) = 7

Answer 1

Hi again :)

Answer 2

lol hello:)

Answer 3

i think we should be able to ask multiple questions on here at a time because i have quite a few xD

Answer 4

expand and collect like terms

x^2 +x - 27 = 0

a = 1, b = 1 and c = -27

substitute into

\[x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\]

Answer 5

First multiply the the brackets like this,
\(\Large x^2+5x-4x-20=7\)
\(\Large x^2+x-20=7\)

Now it is the quadratic equation.
The quadratic equation is the one which has 2nd degree.