Question

Kak tolongin jawabin soalnya.ngk paham maksud soalnya ,soal logaritma

Answer 1

Log ( x²+7x+20) = 1
log ( x²+7x+20)  = log 10
 x²+7x+20 = 10
x²+7x+20-10  = 0
x²+7x+10  = 0

x1+x2  = -b/a  = -7/1 = -7
x1 x2 = c/a  = 10/1 = 10

(x1+x2)² - 4 x1 x2
= (-7)² -4 (10)
= 49 -40
= 9

Answer 2