Question

9x^2+(7a-5)x+25=(3x+5)^2 Find the value of "a"

Answer 1

Answer:

9x^2+(7a-5)x+25=(3x+5)^2

Step-by-step explanation:

first expand (3x+5)^2

=$3x^{2} +30x+25$

now, $9x^2+(7a-5)x+25=3x^{2} +30x+25$

=$9x^{2} -3x^{2} +25-25+{7a-5}x=30x$

$6x^{2} +7ax-5x-30x\\=7ax-35x\\\\a=35x/7x\\a=5$