Question

If a+b=7 and ab=10 then the value of a²+b²is​

Answer 1

Answer:

a = 7-b

a2 = 49-14b+b2

b2 = 49-14a+a2

Answer 2

Step-by-step explanation:

• a+b=7
• (a+b)^2=7^2 (bath side square)
• a^2+b^2+2×a×b=49
• a^2 +b^2=49-2ab
• a^2+b^2=49-2×10 (ab= 10)
• a^2+b^2=49-20
• a^2+b^2=29