Factorise the following expressions :-
(i)x^2+11x+30
(ii)7x^2+49x+84
(iii)9x^2+18x+8
(iv)15x^2+2x-8
(v)10x^2-9x-7
Answers
Answered by
2
1......x^2+11x+30=0
x^2+6x+5x+30=0
x(x+6)+5(x+6)=0
(x+6)(x+5)=0
therefore, x=-6 and-5
2....7x^2+49x+84=0
x^2+7x+12=0
x^2+3x+4x+12=0
x(x+3)+4(x+3)=0
(x+3)(x+4)=0
therefore x=-3,-4
similarly do for all above given expression.
x^2+6x+5x+30=0
x(x+6)+5(x+6)=0
(x+6)(x+5)=0
therefore, x=-6 and-5
2....7x^2+49x+84=0
x^2+7x+12=0
x^2+3x+4x+12=0
x(x+3)+4(x+3)=0
(x+3)(x+4)=0
therefore x=-3,-4
similarly do for all above given expression.
achaldoshi23:
I said to factorise not find the value of x
Answered by
1
What is ^ in the question
It means carrot that mean we need to find power. For ex. 3^3 this means we need to find 3 cube
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