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3 years ago

What are the solutions of the quadratic equation (x + 3)2 = 49?

Mathematics

2 answers:

kirza4 [7]3 years ago

8 0

Answer:

Step-by-step explanation:

Evgesh-ka [11]3 years ago

3 0

The answer would be C. if u plug in 4 it would be (4+3)=7x2=49 and also (-10+3)=-7,-7x2 is 49 it works for both so the answer would be C.

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lesya [120]

Answer:

Therefore the area of rectangle is increased by 15.5%.

Step-by-step explanation:

Assume the length and width of the rectangle be x and y respectively.

The area of the rectangle is = length×width

=xy.

Now the length of the rectangle is increased by 10%.

Then the length of the rectangle increased = $x\times \frac{10}{100}$ .

New length of the rectangle is $=x+\frac{10x}{100}$

$=\frac{100x+10x}{100}$

$=\frac{110x}{100}$

The width of the rectangle is increased by 5%.

Then the width of the rectangle increased = $y\times \frac{5}{100}$ .

New length of the rectangle is $=y+\frac{5y}{100}$

$=\frac{100y+5y}{100}$

$=\frac{105y}{100}$

New area of the rectangle is = $\frac{110x}{100}\times\frac{105y}{100}$

= 1.155 xy.

The percentage of area increase is

$=\frac{\textrm{New area - Original area}}{\textrm{Original area}}\times 100$

$=\frac{1.155xy-xy}{xy}\times 100$

$=\frac{0.155xy}{xy}\times 100$

=15.5.

Therefore the area of rectangle is increased by 15.5%.

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Step-by-step explanation:

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