Solve:
1. () (x - 3)(x + 7) = 0
Answers
Answered by
1
Answer:
(x-3) (x+7) =0
→x(x+7) -3(x+7) =0
→x²+7x-3x-21=0
→x²+4x-21=0
→x²+7x-3x-21=0
→x(x+7) -3(x+7) =0
→(x-3) (x+7) =0
→x-3=0 or x+7=0
→x=3 or x=-7
Answered by
1
( x - 3)( x + 7 ) = 0
=> x^2 + 7x - 3x - 21 = 0
=> x ( x + 7 ) -3 ( x + 7 )
=> ( x + 7 )( x - 3) = 0
=> x = -7 (or) x = 3
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