factorise by splitting middle term :1) x^2+23x+90 2)x^2+16x+55 3)3x^2+8x+5
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1. x²+23x+90
x²+18x+5x+90
x(x+18)+5(x+18)
(x+18)(x+5)
2. x²+16x+55
x²+11x+5x+55
x(x+11)+5(x+11)
(x+5)(x+11)
3. 3x²+8x+5
3x²+3x+5x+5
3x(x+1) +5(x+1)
(x+1)(x+5)
x²+18x+5x+90
x(x+18)+5(x+18)
(x+18)(x+5)
2. x²+16x+55
x²+11x+5x+55
x(x+11)+5(x+11)
(x+5)(x+11)
3. 3x²+8x+5
3x²+3x+5x+5
3x(x+1) +5(x+1)
(x+1)(x+5)
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