Solve this equation using an algebraic method: (x + 4)( x - 4) = 9

Mathematics

2 answers:

Mila [183]3 years ago

8 0

(x+4)(x-4)=9 carry out multiplications on left side

x^2-16=9 add 16 to both sides

x^2=25 take the square root of both sides

x=√25

x=±5

So there are two solutions x=-5 and 5

Svetradugi [14.3K]3 years ago

3 0

This is the answer that i was going to upload :
the answer is +5(or)-5 because of root

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elaine has a rectangular gift wrapper that measure 30 cm by 25 cm she wants to cut it into square sheets of the same size to be

12345 [234]

Answer:

Square length of 5cm

Step-by-step explanation:

Given

$Length = 30cm$

$Width = 25cm$

Required

Determine the possible measure of square from the rectangular sheet

To do this, we simply calculate the greatest common factor (GCF) of the dimension of the rectangle.

$30 = 2 * 3 * 5$

$25 = 5 * 5$

The common factor is: 5

<em>Hence, the side length of the square is 5cm</em>

6 0

3 years ago

47 1/2 of what number is 190

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