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Solve the following by factoring:
a) x²- 6x -16=0

b) 6x² + 42x = 0

2007-07-23 04:24:16 · 2 answers · asked by DEE H 1 in Science & Mathematics ➔ Mathematics

2 answers

x²- 6x -16=0

(x - 8)(x + 2) = 0

x = 8, x = -2

6x² + 42x = 0

x(6x + 42) = 0

x = -7, x = 0.
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2007-07-23 04:29:21 · answer #1 · answered by Robert L 7 · 0⤊ 0⤋

a.) x^2-6x-16=0

1st Step- Factors of 16 that add up to -6 (2,-8)

(x+2)(x+8)=0

Take opposite - - Final Answer (x= -2) (x= 8)

b.) 6x^2+42x=0

(You can factor out a 6x from this equation)

6x(x+7)=0

Subtract 7 from both sides

Final answer- (x= -7) (x= 0)

2007-07-23 04:44:45 · answer #2 · answered by N 3 · 0⤊ 0⤋