solve by formula method. 7x² + 15x + 8 = 0
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Answer:
-8/7 or -1
Step-by-step explanation:
7x²+15x+8=0
7x²+7x+8x+8=0
(7x²+7x)+(8x+8)=0
7x(x+1)+8(x+1)=0
(7x+8)(x+1)=0
7x+8=0 .or x+1=0
7x=-8. [x=-1]
[x=-8/7]
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