Question

Given the relation y = 7x2 + 3, if the input is 4, what is the output?

Answer 1

Answer:

y=7(4)+3

y=14+3

y=17.....

Answer 2

Answer:

I'm assuming that you meant:

y = 7x² + 3

Remember! Inputs are always x values (unless stated otherwise). Meaning the problem says:

x = 4

y = 7(4)² + 3

The square only applies to the 4. The 7 is not going to be squared! (To be exact it only applies to whatever the value of x is.

4² = 4·4 = 16

Remember:

Parenthesis

Exponents

Multiplication

Division

Addition

Subtraction

Follow PEMDAS from left to right (or in the case above from top to bottom).

7·16 + 3 = ?

16·7 = 10·7 + 6·7 = 70 + 42 = 112

(All I did to multiply was break it up into parts. If it confuses you don't worry about it, and just multiply it out like normal or use a calculator if you are allowed to)

112 + 3 = ?

Our output is:

115!