The longest side of a triangle is 9 more units than the shortest side . The third side is three times the length of the shortest side. If the perimeter of the triangle is 84 units, write and solve equation to find the lengths of all three sides of the triangle​

answer: they are supplementary angles

step-by-step explanation: 161+19=180. supplementary angles equal 180 degrees

option (a)

step-by-step explanation:

step 1:   take 2 number whose product equal to 25..

and sum of those two number are -10

step: 2 for example here if we take 5,5 are the number,,

5*5=25

and

5+5=10

but we need -10

so if we take   -5,-5

so -5*-5=25

and -5+(-5)=-10

s0

come the equation

replace -10x by these number

like -5x -5x+25

take common

x(x-5)-5(x-5)=0

(x-5)(x-5)=0