How to solve an eqution by using expansion formula

Topic:-Expansions

We have different expansion formula's like

• (a+b)²=a²+b²+2ab
• (a-b)²=a²+b²-2ab
• (a+b+c)²=a²+b²⁺+c²⁺+2ab+2ba+2ca

To solve different linear equations , and polynomials we use this formula's


Question:-

Expand using suitable formula


(3x+y)²

Answer:-

Expansion formulae
-------------------

(a+b)²=a²+b²+2ab

Let's use this in given question

(3x+y)²

here a=3x and b=y


So,(3x)²+y²+2*3x*y

=3²x²+y²+6xy

9x²+y²+6xy is the Answer



For more help on this,you can reply me.