Question

for what value of x both the polynomial x^2-4x+3 and x^2+4x-21 become zero

Answer 1

Answer:

Value of X=3

Step-by-step explanation:

Steps:

x^2-4x+3=0--------(1)

x^2+4x-21=0-------(2)

by elimination method:

subtract (1) from (2)

    x^2+4x-21=0

    x^2-4x+3 =0

______________

      0+8x-24=0

            8x=24

            x=24/8

        so X=3

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