Question

x2 - 10x + 21 factorise using identities​

Answer 1

Step-by-step explanation:

x2 - 10x + 21 = x^2-7x-3x+21

x2 - 10x + 21 = x(x-7) -3(x-7)

x2 - 10x + 21 = (x-7)(x-3)

so value of x = 7,3

Answer 2

Answer:

solution, x²-10x+21

=x²-7x-3x+21

=x(x-7)-3(x-7)

=(x-7)(x-3)

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