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if x=-7 and y=4 what would x^2-3xy=

Sagot :

themathexpertise

Answer:

While x = -7 and y = 4, x² - 3xy = 133.

Step-by-step explanation:

x² - 3xy

Substitute variables.

(-7)² - 3(-7)(4)

Square -7 remembering that (-x)² = x².

49 - 3(-7)(4)

Multiply -7 and 4.

49 - 3(-28)

Multiply -3 and -28.

49 + 84

Add 49 and 84.

133

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