Solve for m.

m
9
=
25
m

A)
± 216

B)
± 225

C)
± 14.6

D)
± 15

Question

Solve for m.

m
9
=
25
m
	

A)
	± 216 	
	

B)
	± 225 	
	

C)
	± 14.6 	
	

D)
	± 15

anonymous · Answer

This is a proportion. It should look like m/9 = 25/m

parthkohli · Answer

1) Multiply both sides by 9.
2) Multiply both sides by m.
3) Solve the quadratic equation that you get.

lgbasallote · Answer

cross multiply
$$\frac m9 = \frac{25}{m}$$
$$m^2 = 25\times 9$$
$$m^2 = 225$$
$$m = \pm \sqrt{225}$$
\[m = \pm 15

theviper · Answer

Cross multiply :-
$$\Large{\frac{m}{9}=\frac{25}{m}}$$$$\Large{m \times m=25 \times 9}$$$$\LARGE{{m^2=225}}$$

anonymous · Answer

what do you mean by both sides?

parthkohli · Answer

Never mind, that is not a quadratic equation.

lgbasallote · Answer

$$m = \pm 15$$
is what i meant in my last line

theviper · Answer

$$\Huge{m=\pm 15}$$

anonymous · Answer

OHHHHHH OKAY! I get it lol I miss-read it

anonymous · Answer

cross multiplication  method is easy for you.

theviper · Answer

Understood??

anonymous · Answer

Thanks @muhammad9t5 @TheViper @Igbasallote and @ParthKohli !!!!!!

parthkohli · Answer

You're welcome! :)

theviper · Answer

Most Welcome :)

anonymous · Answer

I would not actually do the multiplication of 9 times 25… FWIW