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=2x²-5x+2x-5
=2x²-3x-5
b.(4x+3)(x+3)
=4x²+12x+3x+9
=4x²+15x+9
A.) 2x² - 3x - 5 = ( x + 1 ) ( 2x - 5 )
=> x dikali 2x = 2x² , 2x dikali 1 = 2x , trus -5 dikali x = -5x , -5 dikali 1 = -5
jadi, 2x² + 2x - 5x - 5 => 2x²- 3x - 5
B.) 4x² + 15x + 9 = ( 4x + 3 ) ( x + 3 )
=> Caranya sama ky diatas .