Using the ac method ax^2 +bx+c
how do i solve this problem? and check the answer back into equation? mark as brainlest on my list !

25x^2 -20x +4

25=5*5=1*25
4=2*2=1*4
Factor to get sum of-20
(5x-2)(5x-2)
solve 5x-2=0=>x=2/5 is root of multiplicity 2 for both functions.

So
find ac
list all products that equal ac
find the ones that add to b
rewrite
factor
undistribute
so

25x^2-20x+4
ac=4*25=100
what 2 numbers, when multipied together, results in 100 but adds to -20?, I did this in previous quesiton, the answer is -10 and -10

25x^2-10x-10x+4
(25x^2-10x)+(-10x+4)
(5x)(5x-2)+(-2)(5x-2)
factor out (5x-2)
(5x-2)(5x-2)
well, there is no equal sign, but we will assume it equals 0
(5x-2)^2=0
5x-2=0
5x=2
x=2/5

Answer: question no. 1 -a. yes, the sides are in the ratio 2 : 5.question no. 2 -b. 59°question no. 3 -c. angles x and y are remote interior angles.question no. 4 -d. 90°, 45° and 45°question no. 5 -b. mn and qrstep-by-step explanation: question no. 1 -rs : xu = 3 : 7.5 = 2 : 5rt : x? = 6.4 : 16 = 2 : 5st : u? = 6 : 15 = 2 : 5as the ratios of all sides are equivalent, the triangles must be congruent and the sides must be proportional.therefore, the answer is: a. yes, the sides are in the ratio 2 : 5.question no. 2 -in the second diagram, angle b is the only letter not shown. therefore, the number must be equivalent to angle b.if we substitute the value of angle b as being 22° in the first diagram, we can now use the angle sum of a triangle to obtain the value of angle a.angle sum of a triangle = 180°therefore: let angle a = aa + 99 + 22 = 180a = 180 - 99 - 22a = 59°therefore, the answer is: b. 59°question no. 3 -angles x and y don't share the vertex of the triangle with the exterior angle w. remote interior angles don't share a vertex of a triangle with an exterior angle. this means that angles x and y are remote interior angles.therefore, the answer is: c. angles x and y are remote interior angles.question no. 4 -the sum of all interior angles of a triangle must be equivalent to 180°.90°, 45° and 45° are the only set of angle measures that are equivalent to 180°.therefore, the answer is: d. 90°, 45° and 45°question no. 5 -the only pair of sides stated in the options which are corresponding are mn and qr.therefore, the answer is: b. mn and qr.