Question

If y = x 2 - 4 is being graphed using the table method, what is the y-value generated when x = - 2 ?

Answer 1

Answer:

(There's a confusion here, is x 2 x times 2? The answer and explanation are based on x multiply by 2)

y = -8

Step-by-step explanation:

Substitution Method-

y = x 2 - 4

x = -2

y = (-2) 2 - 4

PEMDAS - parentheses; exponents; Multiplication & Division; Addition & Subtraction

we are going to multipl -2 and 2 together ---> -4

y = -4 - 4

Same sign add, different sign subtract.

Same sign keep the sign, different sign keep the larger.

y = -8

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