Question

3. Factorise the following quadratic polynomials by
splitting the middle term :
(i) x2-18x + 77
(ii) x2 - 25x + 144
(iii) 1 - x - 72x2
(iv) 22 - 22x - 48
(v) 40 + 3x - 32
(vi) x2 - 5x – 24​

Answer 1

Answer:

(i)letp(x)=x2-18x+77

thenp(x)=0

x2-7x-11x+77=0

x(x-7)-11(x-7)=0

(x-11) (x-7)=0

then;x-11=0orx-7=0

we get x=11 or x=7