Question

Q.20). Find the value of “p” from
the polynomial x2 + 3x + p, if one
of the zeroes of the polynomial is
2​

Answer 1

Given that one zero is 2.

so, x-2 be a factor.

let, f(x) = x2 + 3x + p

f(2) = 0

or, 2^2+3×2+p =0

or, 4+6+p =0

or, 10+p =0

or, p=-10 Ans.

Answer 2

Answer:

$f(x) = 2 \\ putting \: value \: in \: x \\ 2 ^{2} + 3 \times 2 + p = 0 \\ 4 + 6 + p = 0 \\ 10 + p = 0 \\ p = - 10 \\ answer$