y^4 - 81 use identity (a-b) (a+b)
Answers
Answer:
(i) Algebraic Expression
• Terms are formed by the product of variables and constants, e.g.
–3xy, 2xyz, 5x2, etc.
• Terms are added to form expressions, e.g. –2xy + 5x2.
• Expressions that contain exactly one, two and three terms are
called monomials, binomials and trinomials, respectively.
• In general, any expression containing one or more terms with non-
zero coefficients (and with variables having non-negative exponents)
is called a polynomial.
• Like terms are formed from the same variables and the powers of
these variables are also the same. But coefficients of like terms
need not be the same.
• There are number of situations like finding the area of rectangle,
triangle, etc. in which we need to multiply algebraic expressions.
• Multiplication of two algebraic expressions is again an algebraic
expression.
• A monomial multiplied by a monomial always gives a monomial.
• While multiplying a polynomial by a monomial, we multiply every
term in the polynomial by the monomial using the distributive
law a ( b + c) = ab + ac.
Answer:
y=±3,y=±3i
Step-by-step explanation:
As a^2-b^2=(a-b)(a-b)
y^4 - 81=(y^2-9)(y^+9)
y=±3, y=±3i [i=√-1]