Question

please answer this question of class 9 chapter number 2 polynomial please answer fast it's urgent question no 15 ​

Answer 1

(a+b+c)² = a²+b²+c²+2(ac+bc+ca)

(20)² = 90+2(ab+bc+ca)

400 = 90+ 2(ab+bc+ca)

400-90 =2(ab+bc+ca)

310 = 2(ab+bc+ca)

ab+bc+can=310/2

ab+bc+ca = 155

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