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Chapter 1: Q33. (page 18)

Evaluate the expression when x=4,鈥塧苍诲y=3

localid="1648722643340" 7(x2鈭�5y)

Short Answer

Expert verified

The value of expression is7.

Step by step solution

01

Step-1 – Order of operations

To evaluate any expression involving more than one operation, follow the below order of operations:

  • First evaluate expressions inside grouping symbols like parentheses ( ) or brackets [ ].
  • Evaluate the exponents.
  • Perform Multiplication and division from left to right.
  • Perform addition and subtraction from left to right.
02

Step-2 – Substitute the values

To evaluate the expression 7(x2鈭�5y), substitute 4 for x and 3 for y in the given expression, and simplify further using the order of operations as shown below,

7(x2鈭�5y)=7(42鈭�5(3))=7(16鈭�5(3))=7(16鈭�15)=7(1)

03

Step-3 – Multiply the numbers

To simplify further, Multiply the resulting numbers to get

7(x2鈭�5y)=7(42鈭�5(3))=7(16鈭�5(3))=7(16鈭�15)=7(1)=7

So, the value of the expression is 7.

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