Question

solve the quadratic equation by factorisation method x^2+ 10 x - 21 =0​

Answer 1

Answer:

Answer is 1.75

Step-by-step explanation:

Answer

x^2+10x-21=0

12x=-21

x=21/12

x=1.75

May this be helpful to you

Answer 2

Answer:

x²+10x+21=0

x²+(3+7)x+21=0

x²+3x+7x+21=0

x(x+3)+7(x+3)=0

(x+3)(x+7)=0

either x+3=0 or x+7=0

either x=-3 or x=-7

I think you mistakenly wrote X²+10x-21 instead of x²+10x+21.