Evaluate the expression (x − 5xy)(7 + yz) if x = 1, y = −3, and z = 4.

Question

Evaluate the expression (x − 5xy)(7 + yz) if x = 1, y = −3,  and z = 4.

Quizplus · Accepted Answer

Step 1: Substitute the numbers into the given expression.
x = 1, y = −3,  and z = 4
(x − 5xy)(7 + yz)
(1 − 5 × 1 × −3)(7 + −3 × 4)
Step 2: Simplify following PEMDAS:
Parentheses and Exponents. There are no exponents, but we can simplify inside the two sets of parentheses.
(1 − 5 × 1 × −3)(7 + −3 × 4)
(1 − −15)(7 + −12)
(16)(−5)
Multiplication and Division. We can now multiply 16 and −5.
(16)(−5)
−80

Evaluate the Expression (X − 5xy)(7 + Yz) If X