Algebra 2

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Algebra 2 Section 7.3 B (pg 171) Quadratic
Formula
Solve each equation by using the quadratic
formula. (final answers should be in simplest
radical form)
15. 9y2 6y 7
get in standard form (ax2 bx c 0) always
try to keep the y2 term positive
-6y 7 -6y 7 9y2 6y 7 0
a b c
9 -6 -7
3
3
17. 2y2 6y - 1
get in standard form (ax2 bx c 0) always
try to keep the x2 term positive
-6y 1 -6y 1 2y2 6y 1 0
a b c
2 -6 1
2
4
19. y2 8y 16 0
a b c
1 -8 16
4
5
21. t2 11 0
save time dont use quadratic formula
11 11 t2 11
6
23. 0 9y2 12y 4
9y2 12y 4 0
a b c
9 12 4
7
25. 4x2 7x
get in standard form (ax2 bx c 0)
-7x -7x 4x2 7x 0 0
put in 0 for the c term
a b c
4 -7 0
14 or 0 8 8
7 or 0 4
7 7 or 7 7 8 8
8
27. 4y2 20y - 25
-20y 25 -20y 25 4y2 20y 25 0
a b c
4 -20 25