Question

if 3 is zero of polynomial P(x)= 2 x square - 5 x + 7a,find the value of a​

Answer 1

Step-by-step explanation:

As 3 is the zero of the polynomial

so

$({2 \times 3})^{2} - (5 \times 3) + 7a = 0 \\ = > {6}^{2} - 15 + 7a = 0 \\ = > 36 - 15 + 7a = 0 \\ = > 21 + 7a = 0 \\ = > 7a = - 21 \\ = > a = - 3$

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Answer 2

Step-by-step explanation:

2×3×3-5×3+7a=0. 18-15+7a=0. 3+7a=0

7a=-3

a=-3÷7