16x^2 + 10x - 84
= 2(8x^2 + 5x - 42)
= 2(8x + 21)(x - 2)
16x² + 10x - 84=
2(8x^2+5x-42)=
2(8x+21)(x-2)
16x² + 10x - 84
= ( 8x + 21 ) ( 2x - 4 )
Checking :
( 8x + 21 ) ( 2x - 4 )
= 16x² + 42x - 32x - 84
= 16x² + 10x - 84
2 ( 8x^2 +5x - 42)
COEFF of x^2 = +8
( + 8 ) ( -42) = - 336
FIND FACTORS OF - 336 WHICH ADD UP TO + 5 ( COEFF of x)
( -16) ( +21) = =336
2 ( 8x^2 -16x +21x -42)
2 ( 8x ( x -2) + 21 ( x-2) )
2 ( 8x +21) ( x-2) ANSWER
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Verified answer
16x^2 + 10x - 84
= 2(8x^2 + 5x - 42)
= 2(8x + 21)(x - 2)
16x² + 10x - 84=
2(8x^2+5x-42)=
2(8x+21)(x-2)
16x² + 10x - 84
16x² + 10x - 84
= ( 8x + 21 ) ( 2x - 4 )
Checking :
( 8x + 21 ) ( 2x - 4 )
= 16x² + 42x - 32x - 84
= 16x² + 10x - 84
2 ( 8x^2 +5x - 42)
COEFF of x^2 = +8
( + 8 ) ( -42) = - 336
FIND FACTORS OF - 336 WHICH ADD UP TO + 5 ( COEFF of x)
( -16) ( +21) = =336
2 ( 8x^2 -16x +21x -42)
2 ( 8x ( x -2) + 21 ( x-2) )
2 ( 8x +21) ( x-2) ANSWER
16x² + 10x - 84=
2(8x^2+5x-42)=
2(8x+21)(x-2)