Answer:

Explanation:
Standard form of a quadratic equation:

Question 1
Given:

Rearrange to standard form by subtracting 20 from both sides:


Therefore:
Question 2
Given:

Rearrange to standard form by subtracting 28 from both sides:


Therefore:
Question 3
Given:

Rearrange to standard form by subtracting 225 from both sides:


Therefore:
Question 4
Given:

Rearrange to standard form by subtracting 36 from both sides:


Therefore:
Question 5
Given:

Rearrange to standard form by subtracting 7x from both sides:



Therefore: