How do you solve #3x²=15x#?

2 Answers
G_Dub
Apr 7, 2018

#x=0 or x=5#

Explanation:

#3x^2=15x#

#3x^2-15x=0# subtract #15x# from both sides

#3x(x-5)=0# factorise

#3x=0 or x-5=0# solve each linear equation

#therefore x=0 or x=5#

Jim G.
Apr 7, 2018

#x=0" or "x=5#

Explanation:

#"express the equation in "color(blue)"standard form"#

#•color(white)(x)ax^2+bx+c=0;a!=0#

#rArr3x^2-15x=0#

#"take out a "color(blue)"common factor "3x#

#rArr3x(x-5)=0#

#"equate each factor to zero and solve for x"#

#3x=0rArrx=0#

#x=5=0rArrx=5#

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