Question

Find P(x) = 5x2-3x+7 when x=1
a) 7
b) 15
c) 3
d) 9​

Answer 1

(i) 4x2 – 3x + 7

⇒ 4x2 – 3x + 7x°

∵ All the exponents of x are whole numbers.

∴ 4x2 – 3x + 7 is a polynomial in one variable.

(ii)

∵ All the exponents of y are whole numbers.

∴ is a polynomial in one variable.

(v) x10 + y3 + t50

∵; Exponent of every variable is a whole number,

∴ x10 + y3 + t50 is a polynomial in x, y and t, i.e. in three variables.

Answer 2

Answer:

5(1)2-3(1)+7

5-3+7

2+7

9