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I will give you the formula:
(a+b+c)^{2}=  a^{2} + b^{2} + c^{2} + 2ab+2ac+2bc
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There is 6 step to square a trinomials.....
1.square yhe first term.
2.square the 2nd term.
3.square the last term.
4.twice the product of the 1st & 2nd term.
5.twice the product of the 1st & last term.
6.twice the product of the 2nd & the last term.

GoOd LuCk...
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