Question

•If x = 5 and y = -2, what is the value of 3x2 – 2xy + 4y2?

Answer 1

Answer:

The value of the equation is 111.

Step-by-step explanation:

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$3x^2-2xy+4y^2\\[Substitute the values.]3(5)^2-2(5)(-2)+4(-2)^2\\[According to PEMDAS, evaluate exponents (there is no evaluating in the parenthesis in the equation) next.]3(25)-2(5)(-2)+4(4)\\[According to PEMDAS, evaluate multiplication (there is no division) next.]75-(-20)+16\\[Subtracting a negative will grant you a positive.]75+20+16\\[Add 75 and 20.]95+16\\[Add 95 and 16.]111$

Answer 2

10

Step-by-step explanation:

6=2(-2)x5+4(-2)×2

6=-4×5-8×2

6=-20-8×2

6=-20-16

6=-36