Question

plz plz plz can u help me i am trying for so long plz .Write down the each value of each expression for each value of x : a) x² + 3 b) 21 - 3x² c) 5(3x + 4)​

Answer 1

Solution

Step-by-step explanation:

(A) x³+3=0

x³= -3

(x³)³= (3)³ ( Cubing on both the sides)

x³= 27

x=3

(B) 21-3x²

21-3x²=0

-3x²= -21

x²= 21/3

(x²)² = 7²

x² = 49

x=7

(C) 5(3x+4)

5(3x+4) =0

15x+20=0

15x= -20

x = -20/15

better if we simply it.

x = -4/3

Hope it will help you.

Answer 2

Answer:

Step-by-step explanation:

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.