# 20 points ! evaluate the expression. show your work. 6 x 7 - 3^2 x 9 + 4^3

krystalScott17   ·   20.09.2019 17:10
28.06.2019 11:30
You want the answer to all
28.06.2019 07:00

step-by-step explanation:

27.06.2019 18:00

starting with:

5 + x - 12 = 2x - 7

5 + x - 12 - x = 2x - 7 - x (subtract x from both sides)

5 - 12 = x - 7 (combine and cancel x's from both sides)

5 - 12 + 7 = x - 7 + 7 (add 7 to both sides)

0 = x (add numbers together on both sides)

so in order for the equation to be true, x must be 0.

trying x = -0.5

5 + x - 12 = 2x - 7 (original equation)

5 + -0.5 - 12 = 2(-0.5) - 7 (plug in value of x)

5 + -0.5 - 12 = -1 - 7 (did multiplication)

-7.5 = -8 (did addition on both sides)

since -7.5 is obviously not equal to -8, the value of -0.5 for x is wrong.

trying x = 0

5 + x - 12 = 2x - 7 (original equation)

5 + 0 - 12 = 2(0) - 7 (plug in value of x)

5 + 0 - 12 = 0 - 7 (did multiplication)

-7 = -7 (did addition on both sides)

since -7 equals -7, that demonstrates that the value of 0 for x is correct.

trying x = 1

5 + x - 12 = 2x - 7 (original equation)

5 + 1 - 12 = 2(1) - 7 (plug in value of x)

5 + 1 - 12 = 2 - 7 (did multiplication)

-6 = -5 (did addition on both sides)

since -6 is obviously not equal to -5, the value of 1 for x is wrong.

03.01.2022 08:50

25

Step-by-step explanation:

Following the order of operations as stated in PEMDAS

Given

6 × 7 - 3² × 9 + 4³ ← evaluate exponents

= 6 × 7 - 9 × 9 + 64 ← evaluate multiplication

= 42 - 81 + 64 ← evaluate addition

= 106 - 81

= 25

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