Question

If the cost of one book is (x + 5), find the cost of (2x + 3) books.​

Answer 1

Step-by-step explanation:

cost of one book - x + 5

X = -5

cost of (2x+3) books

= (2(-5)+3)

= (-10)+3

= (-7)..

Answer 2

Question:

____________

If the cost of one book is (x + 5), find the cost of (2x + 3) books.

Answer:

__________

2x^2 + 13x + 15

Explanation:

_______________

Cost of 1 book = ( x + 5 )

Number of books = ( 2x + 3 )

Hence,

Cost of ( 2x + 3 ) books

= ( x + 5 )( 2x + 3 )

= x( 2x + 3 ) + 5( 2x + 3 )

= 2x^2 + 3x + 10x + 15

= 2x^2 + 13x + 15

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