Question

I need help with quadratic equations. :3

Answer 1

When the quadratic equation y = (x − 3)(2x + 7) is written in standard form, what is the value of the coefficient "b"?

2

−21

−1

1

Answer 2

ax+by+c=0
=>y=2x^2-6x+7x-21
= 2x^2+x-21

coeff b = 1

Answer 3

Thank you very much!

Answer 4

no prob !

Answer 5

Do you want to help me with some more?

Answer 6

sure till I log off :P

Answer 7

Ok this one is vertex What is the vertex for the graph of y = −3x2 + 18x − 13?

(−3, −40)

(−3, −94)

(3, 23)

(3, 14)

Answer 8

Substitue the points one by ont in your equation, if you get a 0---well, thats your vertex !

Answer 9

*one by one

Answer 10

Ok thanks again. XD