Question

(i) One of the roots of the quadratic equation 5x2 + kx - 7=0 is – 1. Complete the following activity to find the value of k.
-1 is the root of the quadratic equation 5x + kx – 7 = 0.

... substitute x = -1 in the equation.

... 5 x ___ +k x ___ -7 = 0
... ___ - ____ -7 = 0
... ___ -k = 0
... k = ___
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Answer 1

answer is 2 by solving the question u will get this answer only☺