factorize the following 3;4;5
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3) x²-7x-60
= x²-12x+5x-60
= x(x-12)+5(x-12)
= (x+5)(x-12)
4) 2x²-17x+36
= 2x²-8x-9x+36
= 2x(x-4)-9(x-4)
= (2x-9)(x-4)
5) 3x²+4x-5
This question needs to be done using the formula:-
x= (-b±√(b²-4ac))/(2a)
so x= (-4±√(4²-4(3)(-5))/2(3)
x= (-4±√76)/(6)
x= 2(-2+√19)/6 or x= 2(-2-√19)/6
x= -2+√19/3 or x= -2-√19/3
∴x= 0.786 or x= -2.12
= x²-12x+5x-60
= x(x-12)+5(x-12)
= (x+5)(x-12)
4) 2x²-17x+36
= 2x²-8x-9x+36
= 2x(x-4)-9(x-4)
= (2x-9)(x-4)
5) 3x²+4x-5
This question needs to be done using the formula:-
x= (-b±√(b²-4ac))/(2a)
so x= (-4±√(4²-4(3)(-5))/2(3)
x= (-4±√76)/(6)
x= 2(-2+√19)/6 or x= 2(-2-√19)/6
x= -2+√19/3 or x= -2-√19/3
∴x= 0.786 or x= -2.12
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