What is the value of (2x^2-5x+4)if x =7

Mathematics

2 answers:

aliina [53]3 years ago

8 0

2x² - 5x + 4
= 2(7)(7) - 5(7) + 4
= 98 - 35 + 4
= 67

Troyanec [42]3 years ago

6 0

<span>We have to use PEMDAS for this expression.

Parentheses
Exponents
Multiplication
Division
Addition
Subtraction

</span>(2x^2 - 5x + 4) Original Mathematical Expression

[2(7)^2 - 5(7) + 4] Plugging the value of x, 7 into expression.

There are parentheses, so that means we have to work in them.

There are exponents, so we have to do those first.

[2(49) - 5(7) +4] Exponents.

There is multiplication, that we can do, so we do that left to right.

[98 - 35 + 4] Multiplication.

There is no division.

There is addition and subtraction, so we do those left to right.

[63 + 4] Subtraction.

67 Addition.

Final Answer: 67

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