## Trending News

### 8 Answers

- Engr. RonaldLv 72 months ago
A = lw

10 = x(x + 3)

10 = x^2 + 3x

x^2 + 3x - 10 = 0

(x + 5)(x - 2) = 0

x + 5 = 0, x - 2 = 0

x = - 5, x = 2

prefered x = 2 Answer//

disregard x = - 5 since it's a negative number/

solving its dimension

L = 2

w = x + 3 = 2 + 3 = 5

- PinkgreenLv 72 months ago
(x+3)x=10

=>

x^2+3x=10

=>

x^2+3x-10=0

=>

x^2-2x+5x-10=0

=>

x(x-2)+5(x-2)=0

=>

(x-2)(x+5)=0

=>

x=2 or x=-5 (rejected, for x must not negative)

=>

x=2 cm is the answer.

- 2 months ago
The answer is 2 because if you think of all the multiplication facts that have a product of 10, you mostly can find out the answer quickly, for example, the first one that mostly comes to your mind is 5 x 2, but if you do 5 + 3 = 8 x 2, it's 16, that doesn't work. Or, flip it and do 2 x 5, 2 + 3 = 5 x 2 = 10

So the answer is 2

- How do you think about the answers? You can sign in to vote the answer.
- stanschimLv 72 months ago
A(x) = x(x + 3) = 10

A(x) = x^2 + 3x = 10

x^2 + 3x - 10 = 0

(x + 5)(x - 2) = 0

x = 2 is the only positive answer. We must throw out -5, since lengths cannot be negative.

- Ian HLv 72 months ago
x*(x + 3) = 10

By inspection x = 2 because 2* 5 = 10

Not necessary to form and solve the quadratic

- billrussell42Lv 72 months ago
area = height x width

A = 10 = (x+3)(x)

x² + 3x – 10 = 0

(x + 5)(x – 2) = 0

x = 2 (ignoring negative answer)

rectangle is 2 x 5