Maths-
General
Easy
Question
Write the product in standard form. (𝑥 − 7)2
Hint:
The methods used to find the product of binomials are called special products.
Multiplying a number by itself is often called squaring.
For example (x + 3)(x + 3) = (x + 3)2
The correct answer is: 49
(𝑥 − 7)2 can be written as (𝑥 − 7)(𝑥 − 7)
(𝑥 − 7)(𝑥 − 7) = x(x - 7) - 7(x - 7)
= x(x) + x(-7) - 7(x) - 7(-7)
= x2 - 7x - 7x + 72
= x2 - 14x + 49
Final Answer:
Hence, the simplified value of (𝑥 − 7)2 is x2 - 14x + 49.
Final Answer:
Hence, the simplified value of (𝑥 − 7)2 is x2 - 14x + 49.
This question can be easily solved by using the formula
(a - b)2 = a2 - 2ab + b2
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